"O Messenger of Allah." (And he narrated) something similar, in Mursal from.
Sunan an-Nasa'i Book 22, Hadith 206
← Previous Hadith he asked the Messenger of Allah about fasting while traveling. He said: "If," then he said something to the effect that: "If you want, then fast, and if you want, then do not fast.

Sunan an-Nasa'i Book 22, Hadith 205 Next Hadith → "I asked the Messenger of Allah about fasting while traveling. He said: 'If you wish to fast then fast, and if you wish not to fast then do not fast."'

Sunan an-Nasa'i Book 22, Hadith 207